Water stop structure applied to vertical pipe jacking construction

The water stop structure comprises a prefabricated steel part, a sleeve is installed in the prefabricated steel part, an outer arc-shaped elastic piece is connected to the inner wall of the sleeve in an attached mode, an inner arc-shaped elastic piece is connected to the inner wall of the outer arc-shaped elastic piece in an attached mode, and water stop cushion layers are bonded to the inner wall of the outer arc-shaped elastic piece and the inner wall of the inner arc-shaped elastic piece correspondingly. Supporting side plates are installed on the two sides of the outer portion of the prefabricated steel part correspondingly, inserting rods are assembled at the two ends of the outer portion of each supporting side plate correspondingly, and through adaptive deformation of a plurality of pressure springs in the extrusion mechanism, lateral pressure can be conveniently applied to the connecting plate, the roller frame and the outer portion of the extrusion side roller in time; the outer arc-shaped elastic pi